Causes your Concentration Aura to make all affected targets immune to Silence and Interrupt effects and improve the effect of Devotion Aura, Resistance Aura, and Retribution Aura by 100%. Lasts 6 sec.

Aura Mastery is a Paladin ability, you will need to spend points in the Holy tree to get it.

Patch changes

Patch 3.3.0 (08-Dec-2009): This effect of this talent has been reduced in duration to 6 seconds.

Patch 3.1.0 (14-Apr-2009): Now grants anyone affected by Concentration Aura immunity from Interrupt and Silence mechanics, and increases the effectiveness of all other auras by 100%. Lasts 10 seconds. 2-minute cooldown.